isn't,doesn't,don't分别用在哪里?怎么用?求救!在填空时经常不知道要添哪一个..什么时态,人称用哪个..定义例子都要啊.....

isn't aren't don't doesn't的区别! am not,aren't,isn't,can't,don't,doesn't.的区别及用法. Bob____at school.He is at home.【can't,isn't,aren't,don't,doesn't】 isn't/aren't working和doesn't/don't working 用法区别! Lily ____goshopping on Sundays with her mother选择isn't aren't don't doesn't 用am not.aren't.isn't.don't.doesn't.来完成句子. Mary and Linda___here now.A.aren't B.don't C.isn't D.doesn't don't won't doesn't isn't 这些词的用法,欢迎补充 He______a teacher?A,don't B,doesn't C,isn't D,aren't Mr Smith_______French.A.isn't speak B.doesn't speak C.doesn't say D.don't speak The boy usually__his homework at school.A,doesn;t B,isn't C,doesn't do D,don't do Mary _______late for class.A：isn't.B：doesn't.C：doesn't be.D：don't be I speak Chinese,but Mary______.A.doesn't B.don't C.isn't she sings very well,()she?(don't,isn't,doesn't) The boy ( )surf the Net A.isn't B.doesn't C.don't my watch_____work.A.isn`t B.doesn`t C.don`t whether he succeeds or fails_____concern me.A.don’t B isn’t C doesn’t ______ go .A Not B Don't C Doesn't D Isn't